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Kim Lefmann, Peter Willendrup

Kim Lefmann, Peter Willendrup. An introdution to. McStas. n. McStas introduction. Flexible, general simulation utility for neutron scattering experiments. Original design for M onte c arlo S imulation of t riple a xis s pectrometers Developed at RISØ DTU and ILL, Grenoble.

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Kim Lefmann, Peter Willendrup

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  1. Kim Lefmann, Peter Willendrup An introdution to

  2. McStas n McStas introduction • Flexible, general simulation utility for neutron scattering experiments. • Original design for Monte carlo Simulation of triple axis spectrometers • Developed at RISØ DTU and ILL, Grenoble. GNU GPL license Open Source • V. 1.0 by K Nielsen & K Lefmann (1998)‏ • Currently 2.5+1 people full time plus students Project website at http://www.mcstas.org neutron-mc@risoe.dk mailinglist

  3. McStas n McStas introduction

  4. McStas n What is McStas used for? • Instrumentation • Planning • Construction • Virtual experiments • Data analysis • Teaching

  5. McStas n What is McStas used for? • Instrumentation • Planning • Construction • Virtual experiments • Data analysis • Teaching

  6. McStas n Simulated What is McStas used for? • Instrumentation • Planning • Construction • Virtual experiments • Data analysis • Teaching Real data

  7. McStas n What is McStas used for? • Instrumentation • Planning • Construction • Virtual experiments • Data analysis • Teaching

  8. McStas n What is McStas used for? • Instrumentation • Planning • Construction • Virtual experiments • Data analysis • Teaching (KU 2005-2007)‏

  9. McStas n What is McStas used for? • Instrumentation • Planning • Construction • Virtual experiments • Data analysis • Teaching (KU 2005-2007)‏

  10. McStas n What is McStas used for? • Instrumentation • Planning • Construction • Virtual experiments • Data analysis • Teaching (KU 2005-2007)‏

  11. McStas n McStas neutron rays Neutron ray/package: Weight (p): # neutrons (left) in the package Coordinates (x,y,z)‏ Velocity (vx,vy,vz)‏ Spin (sx,sy,sz)‏

  12. McStas n McStas components Components: Here the neutron physics happen, neutron weight adjusted according to scattering probabilities etc.

  13. McStas n McStas instrument Instrument: positioning + transformation between sequential component coordinate systems, e.g. neutron source, crystal, detector.

  14. McStas n McStas instrument

  15. Portable code (Unix/Linux/Mac/Win32)‏ Write in (simple) 'instrument' language 'Component' files (~100) inserted from library Sources, optics, samples, monitors If needed, write your own components GUI / commandline functionality Tools for plotting and datahandling included McStas n McStas overview

  16. Short McStas introduction n McStas

  17. Three levels of source code: Instrument file (All users)‏ Component files (Some users)‏ ANSI c code (no users)‏ McStas n How is it done?

  18. McStas n Instrument file Instrument file: Written by you!

  19. McStas n Component file Component file: Written by developers and possibly you!

  20. McStas n Generated c-code McStas is a (pre)compiler! Input is .comp and .instr files + runtime functions for e.g. random numbers Output is a single c-file, which can be compiled using e.g. gcc. Can take input arguments if needed. Written by mcstas!

  21. McStas n Demo time! Let's see it run!

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